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小冬和小青共买了20支笔,如果小冬给小青了6支,小青就比小冬多2支,小青买了多少支
小冬和小青共买了20支笔,如果小冬给小青了6支,小青就比小冬多2支,小青买了多少支
2025-03-15 22:59:47
推荐回答（1个）
回答1：
设小青买了x支,小冬买了y支
x+y=20
y-6=x+6-2
解得x=5
y=15
所以小青买了5支
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